Do you say Thank You?

I always reply with a thank you.

However not always get a reply to my e-mails when someone asks for an opinion.
And even once I had this happen:
got an e-mail from a guy asking about a certain speaker and I replied with a very thorough, nice and detailed e-mail reflecting my thoughts on the speakers in question.
Got nothing back from the original requestor, but got an insulting e-mail from his buddy, who disagreed with me displaying a fair amount of rage.
Can't figure this one out, but what are you going to do?

After retiring from the Air Force I owned and operated a small retail business. One day a young lady was hanging around the counter, just observing. Of course I had to ask what she was doing; she was doing a research paper and observing the language patrons used when placing orders. Well I started paying closer attention and realized "give me" or "I want" were used much more often than "please" as the first words for ordering. Now I never place an order without putting a please in somewhere.
As for questions from Audiogon members, I think very rarely has my correspondence ended without a courteous farewell.

Ah, I do miss the good old days when etiquette and common courtesy were the rule of the day. I also was raised to be well-mannered. Lots of please, thank you, you're welcome, yes sir, yes ma'am. Table manners were also of the utmost importance. We actually used to eat regular meals together as a family. Do families do this anymore? I try to be considerate in my e-mails and usually say not only thank you or you're welcome, but have a great day or weekend. By the way,Grant. Have a great weekend. Happy St. Patrick's day as well. Give my regards to the family and happy listening.

I'd settle for correct spelling and grammar ;--) but this reminds me of an incident that took place in Filenes Basement (department store) in Boston. A customer, a woman, took an armload of merchandise up to the cashier who folded it nicely, packed it all in bags, swiped the woman's credit card, and handed her the receipt -- all WITHOUT A WORD, SMILE, OR EYE CONTACT.

As the woman gathered up her purchases, she turned to the salesgirl and said, "A 'thank you' would be nice . . ." to which the salesgirl replied, without missing a beat, "It's printed on ya receipt!"
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I've almost always been thanked for responding to questions, and I sure hope I've remembered to thank everybody I've asked questions of. But here's the real question, perhaps: If you get a query, answer it, and then get a thank you in reply, should the etiquette be that you then have to send the final email saying "You're welcome"?...